Process oe making horseshoe-calks



M. J. GRIFFIN. PROCESS OFjMAKING HORSESHOE CALKS. APPLICATION FIILED JUNE 20, 19H}.

1,324,192. Patented Dee. 9 1919.

@051 s K I )W I I I ATTORNEY MICHAEL J. GRIFFIN, OF HARTFORD, CONNECTICUT.

PROCESS OF MAKING I-IORSESHOE-CALKS.

Specification of Letters Patent.

Patented Dec. 9, 1919.

Application filed June 20, 1918. Serial No. 240,916.

To all whom it may concern:

Be it known that I, MICHAEL J. GRIFFIN, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented a new and Improved Process of Making Horseshoe-Calks, of which the following is a specification.

My invention relates to the process of making that class of devices that are attached to horseshoes and other similar articles to prevent slipping, and an object of my invention, among others, is to provide a process for making devices of this class that shall produce an extremely strong, durable and particularly eflicient calk in a comparatively inexpensive manner.

One form of device constructed in accordance with the process embodying my invention, and in the practice of which process the objects herein'set out, as well as others, may be attained, is illustrated in the accompanying drawings, in which Figure 1 is a plan view of a blank from which a calk'is to be made in accordance with my improved process;

Fig. 2 is a plan view showing this blank bent to partially form the calk;

Fig. 3 is an end view of the same;

Fig. 4 is a side view of the completed calk;

Fig. 5 is an end view of the same; and

Fig. 6 is a side view looking from a point at right angles to the point of view of Fig. 4.

In producing a calk in accordance with my improved process a blank is first formed having a wide shank portion 5 and a narrower spur portion 6 that may be shaped in any desired manner and that is preferably provided with a beveled end 7. This blank is cut or stamped to shape from sheet-meta1, after which it is bent so that the shank portion 5 will assume a U-shape in cross-section,

the spur portion 6 being partially curved, as shown in Fig. 3 of the drawings. Preferably the blank shown in Fig. 1 will be formed to the shape shown in Figs. 2 and 3 in a single operation. The shank portion 5 is then formed into substantially round shape in cross-section, the edges, however, not meeting but leaving an opening 8 that will permit the shank or stem 4: to have some spring action. The stem 4 of the completed calk is preferably tapered from the base of the spur to the opposite end of the stem, the opening 8 being preferably of such width, when the calk is detached from the shoe, that the calk may be entered into the hole to receive it, this end of the stem practically just fitting the mouth of the hole.

In forming the calk the portions 9 at substantially the lengthwise center of the calk are crimped inwardly as at 10 to form the angle or shoulder between the stem or shank 4 and the spur 11.

WVhile the blank shown and described herein is of a shape to produce a highly satisfactory calk in accordance with m improved process, I contemplate that this blank may be changed as to its shape in minor particulars and at the same time enable a very satisfactory calk to be produced by the practice of such process.

I claim- The method of forming horseshoe calks that consists in bending a sheet-metal blank of substantially uniform thickness throughout into a spur of curved shape in crosssection and a trough-like shank with divergent shoulders between said spur and shank, and then bending the shank into tapered tubular shape and simultaneously forming said shoulders at substantially right angles to the shank.

MICHAEL J. GRIFFIN. 

